28 Critical Reflections: random 1 t0 7
This can be explained by the existence of microfacets. We assume that surfaces that are not perfectly smooth are composed of many very tiny facets, each of which is a perfect specular reflector. These microfacets have normals that are distributed about the normal of the approximating smooth surface. The degree to which microfacet normals differ from the smooth surface normal is determined by the roughness of the surface. At points on the object where the smooth normal is close to the half-angle direction, many of the microfacets point in the half-angle direction and so the specular highlight is bright. As one moves away from the center of the highlight, the smooth normal and the half-angle direction get farther apart; the number of microfacets oriented in the half-angle direction falls, and so the intensity of the highlight falls off to zero.[6]
River Form reminds the viewer of a pebble that has been gently shaped by the currents of a churning river. The piece is a contemplation of water, space and the sky. The artist’s interest in exploring the void and the interaction between positive and negative space is evident in the cutaway interior which gives the impression of having evolved over time.[1]
Even admitting that what happens in a camera obscura is something 'similar' to the phenomenon of the specular reflection (which is not questionable), what changes is the fact that an image remains traced somewhere, and any successive discussion about its iconic properties deals with the imprinted image and not with the process itself.[3]
In between the towers and under the ramps you could see what looked like parks, or gardens, but some of them had wilderness areas, and there were tigers. At least they looked like tigers, but maybe that was...[2]
River Form reminds the viewer of a pebble that has been gently shaped by the currents of a churning river. The piece is a contemplation of water, space and the sky. The artist’s interest in exploring the void and the interaction between positive and negative space is evident in the cutaway interior which gives the impression of having evolved over time.[1]
Shiny, and streamlined. With fairings, you know? And fins. All around them, people flying on their own, individually, with some kind of back-pack... jet, I think. No noise. Even the birds weren't disturbed, darting and swooping amid the human flocks.[2]
What alien/other peoples from other-worldly, past or future cultures would have made such a grouping of monolithic structures out of aluminium, brushed or stainless steel? The alien, the natural, the primitive, the advanced coincide in Hepworth's works and garden.[4]
28 Critical Reflections random 8 to 14
Back to Clive's home page
Sources
[1] http://www.neworleanspast.com/art/id62.html
[2] Ken MacLeod, Reflective Surfaces, New Scientist, 2009.
[3] Umberto Eco, A Theory of Semiotics, Indiana University Press, 1979.
[4] Clive Fencott, Reflections on seeing River Form in Barbra Hepworth's garden in St. Ives.
[5] http://www.flickr.com/photos/nigelhomer/316548379/
[6] http://en.wikipedia.org/wiki/Specular_highlight